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"the [science fiction] writer should be able to convince the reader (and himself) that the wonders he is describing really can come true...and that gets tricky when you take a good, hard look at the world around you."
- Frederik Pohl

Keyboard With Changing Keys  
  A computer keyboard with keys faced with little displays, so the label could change based on the application or language.  

There were fifty neat little studs; each, however, had an unlimited number of functions, according to the mode of operation - for the character visible on each stud changed according to the mode.
From Imperial Earth, by Arthur C. Clarke.
Published by Harcourt Brace in 1976
Additional resources -

One of the features on Clarke's Minisec.

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  More Ideas and Technology from Imperial Earth
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